为此给出概念的最简多元最小上界的定义，并提供了寻找最简多元最小上界的有效算法。
We also define the simplified multielement least upper bounds and provide effective algorithm to find them last.
提出了多重图的线图的概念，研究了多重图的线图连通度的上界和下界。
The previous concept of line graph is generalized, and the concept of line graph over multigraph is proposed.
多元最小上界通常会存在大量的冗余，从而增加概念最小上近似表达式的复杂性。
In general, multielement least upper bounds may contain much redundancy, which will increase the expression complexity of the least upper approximation of a concept.
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